Unordered: Merge from trunk.

Anotehr overhaul. Can now use `void_pointer` for links between nodes, although
it doesn't as I don't think `void_pointer` support is strong enough in existing
allocators.

Also no longer relies on using base pointers for custome pointer types.  And
scaled back member function detection to just detect if an allocator has a
member, not what its signature is. I found that the trait could be confused by
ambiguous overloads. This might be fixable.

Better documentation of C++11 compliance to come.


[SVN r74859]

doc/ref.php

@@ -418,7 +418,7 @@ EOL;
                 <para>In version of Boost before 1.48 this emulated the variadic pair
                       constructor from older C++0x drafts. For backwards compatability
                       this can be enabled by defining the macro
-                      <code>BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT</code>.
+                      <code>BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT</code>.</para>
               </notes>
             </method>
             <method name="emplace_hint">
@@ -459,12 +459,11 @@ EOL;
                       for rvalue references or move semantics.</para>
                 <para>Since existing <code>std::pair</code> implementations don't support
                       <code>std::piecewise_construct</code> this emulates it,
-                      but using <code>boost::unordered::piecewise_construct</code>.
+                      but using <code>boost::unordered::piecewise_construct</code>.</para>
                 <para>In version of Boost before 1.48 this emulated the variadic pair
                       constructor from older C++0x drafts. For backwards compatability
                       this can be enabled by defining the macro
-                      <code>BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT</code>.
-                </para>
+                      <code>BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT</code>.</para>
               </notes>
             </method>
             <method name="insert">
@@ -811,10 +810,6 @@ EOL;
               <throws>
                 <para>An exception object of type <code>std::out_of_range</code> if no such element is present.</para>
               </throws>
-              <notes>
-                <para>This is not specified in the draft standard, but that is probably an oversight. The issue has been raised in
-                  <ulink url="http://groups.google.com/group/comp.std.c++/browse_thread/thread/ab7c22a868fd370b">comp.std.c++</ulink>.</para>
-              </notes>
             </overloaded-method>
 <?php endif; ?>
           </method-group>